Keeping an eye on the typical exchange sac on c3, but this move is not the most accurate.
11. f2f3 White plans the traditional attack on the kingside with the advance of the pawns with g4-g5-h4-h5 and so on. 11... b8c6 A move that Vachier-Lagrave had played himself. 12. e1c1  12... c6a5 Black has other options. 13. c1b1 